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  1. By: Cordero, P J - Aparicio, José M. - Parkin, D T
    Type: Article
    In: The journal of raptor research
    Volume: 36
    Issue: 1
    Date: 2002
    Page Range: 70--73
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Cordero, P J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 111
    Date: 1991
    Page Range: 44--46
    Publication Info: London, British Ornithologists' Club, 1893-
  3. By: Manosa, S - Cordero, P J
    Type: Article
    In: The journal of raptor research
    Volume: 26
    Issue: 4
    Date: 1992
    Page Range: 235--238
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-